Insertion type resistance welding method for welding copper and aluminum tubing
a resistance welding and copper and aluminum pipe technology, applied in the field of welding, can solve the problems of not meeting the needs of the industry, the welding industry is not implementing new welding technology and high-caliber machines, and the welding process can be difficul
Inactive Publication Date: 2009-03-26
FENG ERIC
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Benefits of technology
[0006]In a second aspect the present invention provides in combination with a welding machine for welding copper tubing, having an annulated portion formed on one end thereof, and aluminum tubing the improvement comprises an apparatus for assisting in such welding. The apparatus includes a core rod formed of a predetermined material and having a predetermined shape for inserting
Problems solved by technology
Welding copper and aluminum piping can be a difficult process and the technology has not kept up with industry needs.
New welding technology and machines capable of this high caliber effectiveness are not being implemented in the welding industry.
This lack of advancement in the welding industry results in more time-consuming work that ends up being more expensive for the customer.
Method used
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[0015]Prior to proceeding with the more detailed description of the present invention it should be noted that, for the sake of clarity, identical components which have identical functions have been designated by identical reference numerals throughout the several views illustrated in the drawings.
[0016]In a first aspect the present invention provides a method for welding aluminum 2 and copper tubes 4. The method comprises the steps of forming an annulated end 6 on a copper tube 4. That is followed by a step of inserting the annulated end 6 of the copper tube 4 into an aluminum tube 2 and then placing the aluminum tube 2 with the annulated end 6 of the copper tube 4 disposed therein into a resistance welding machine (not shown). There is a step of inserting a core rod 8 through the copper tube 4 and pushing the core rod 8 to a juncture of the annulated end 6 of the copper tube 4 and the aluminum tube 2 for allowing a welded joint 12 to be formed. There is a step of rotating the core ...
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Abstract
A method for welding aluminum and copper tubes. The method comprises the steps of forming an annulated end on a copper tube. That is followed by a step of inserting the annulated end of the copper tube into an aluminum tube and then placing the aluminum tube with the annulated end of the copper tube disposed therein into a resistance welding machine. There is a step of inserting a core rod through the copper tube and pushing the core rod to a juncture of the annulated end of the copper tube and the aluminum tube for allowing a welded joint to be formed. There is a step of rotating the core rod and exerting pressure on the welding joint and applying an electric current to ensure that the aluminum tube and annulated end of the copper tube are welded followed by the step of removing the welded tubing from the welding machine.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is closely related to and claims benefit from U.S. Provisional Application Ser. No. 60 / 974,518 filed Sep. 24, 2007.FIELD OF THE INVENTION[0002]The present invention relates, in general, to welding, and more particularly, the present invention relates to insertion type resistance welding for increasing the strength of welded joints of aluminum and copper tubes.BACKGROUND OF THE INVENTION[0003]Welding copper and aluminum piping can be a difficult process and the technology has not kept up with industry needs. A welded tube with joint length of more than seven millimeters and a helium leaking test of less than 1.3×10−11 Pa m3 s−1 is not in use yet. New welding technology and machines capable of this high caliber effectiveness are not being implemented in the welding industry. This lack of advancement in the welding industry results in more time-consuming work that ends up being more expensive for the customer.[0004]Thus it w...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B23K31/02B23K11/00B23K11/36
CPCB23K11/0935B23K11/20B23K2203/12B23K2203/10B23K2201/06B23K2101/06B23K2103/10B23K2103/12
Inventor FENG, ERIC
Owner FENG ERIC